Distributing-valve.



" J; E. ENGLESSON.

DISTRIBUTING VALVE.

APPLICATION FILED JUNE 27, 1912.

Patented J an. 19, 1915.

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JOHN ELOV ENGLESSON, 0F KARLSKRONA, SWEDEN, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO ALLIS-GHALMERS MANUFACTURING COMPANY, A CORPORATION OFDELAWARE.

DISTRIBUTING-VALVE.

Specification of Letters Patent. 1

Patented Jan. 19, 1915.

Application filed .Tune 27, 1912. Serial No. 706,311.

To all whom it may concern Be it known that 1, JOHN ELov ENGLES- SON, asubject of the King of Sweden, residing at Karlskrona, Sweden, haveinvented a certain new and useful Improvement in Distributing-Valves, ofwhich the following is a specification.

This invention relates to distributing valves in which there is a mainvalve and a pilot valve, the main valve controlling the distribution offluid to and from a distributing conduit, and the pilot valve.controlling and effecting the flow of fluid to and from the ends of themain valve. The work of the pilot valve is only to cause the main valveto be actuatedso as to effect the distribution of the fluid to thedistributing con: duit. The power required to operate-the pilot valve istherefore insignificant as compared with the power required 'to operatethe main valve. This being true, the pilot valve is easily operable froma limited source of power, such as a governor.

' a valve of this kind which is eiiicient and re- The invention isapplicable to many situations in which a weak controlling power isavailable and where the power required to move the main valve isconsiderable.

,The object of the invention is to provide liable in operation and onein which the pilot valve is easily removable for inspection,

and the passages requiring such inspection are located directly-in thestructure of the pilot valve.

One embodiment .of the invention may be had by applying same to a speedgovernor control of a liquid operated servo-motor, and the same isillustrated in the accompanying drawing in which Figure 1 is a sideelevation of a general application of the invention. Fig. 2 'is acentral vertical section through the valve, showing part of theoperating connection, and Fig. 3 is an inverted plan view of the valvecasing.

Referring to the drawing, especially to Fig. 1 thereof, a servo-motorcylinder 5 has a piston 6 and piston rod 7 which may be connected to themain valve of any prime tends upwardly from the valve casing 10'Referring more specifically to Figs. 2 and '3 of the drawing, thedistributing conduits 1 2, terminate annularly in the valve casing 1%).The final discharge 3 connects with annular discharge'channels 15, 16.The supply pipe 4: terminates annularly in the valve oasing '10. Therelative location of these annular spaces within the casing is such thatthe supply .pipe annular space is central; the annular spaces of thedistributing conduits 1, 2, are located adjacent this central annularspace of the supply pipe, and the annular discharge channels 15, 16, liebeyond the annular distributing conduits'l, 2. For convenience ofmanufacture and repair, a bushmg 17 1s fitted to the main longitudinalbore in valve casing 10 and connects by suitable porting with theseveral annular spaces hereinbefore re-ferred to. The bushing 17 islongitudinally bored throughout its length and a piston valve 18 isground to accurately fit the bore of the bushing 17. This piston valveis formed with three grooves 19, 20, 21, connecting with a longitudinalbore'through the'piston valve by suitable ports 22, 23, 24:. The pilotvalve 8 fits within the longitudinal bore of the piston valve 18 and isformed with grooves 25, 26. Internal passages 27, 28, are formed in saidpilot valve and connect the grooves 25, 26, respectively to the spaces29, 30, at the ends of the piston valve 18. These internal passages 27,28, are formed in the pilot valve 8, preferably by longitudinal boringinto each end of the pilot valve and then by lateral boring therethroughto connect this longitudinal bore to the outside, after which the freeends of the longitudinal bores are plugged; or these internal -passagesmay formed by being cored in, if the pilot valve 8 is made by casting.The pilot valve is preferably formed at its upper end with a collar 31which after a sleeve 32is screwed into place in the upper end of theupper cap 33 of the valve casing 28, prevents-the pilot valve from beingwithdrawn from the valve casing 10. The-lower cap 34 of the valve casing10 is formed with a balancing chamher 35 into which thepilot valve 8extends and which is connected by a suitable port 36 to the finaldischarge 3.

The operation is as follows: Assuming that the speed responsive device,the flyball 9, raises pilot valve 8, fluid pressure will be admittedthrough supply pipe 4, its annular terminal space, the correspondingports through bushing 17, the groove 20 and the port 23 in the pistonvalve 18, the groove 26 and the internal passage 28 in the pilot valve 8to the space 30 at the lower end of the piston valve 18. At the sametime the fluid in the space 29 at the upper end of piston valve 18 willbe exhausted through internal passage 27 and groove 25 in the pilotvalve 8, through port 22 and groove 19 in the pistonvalve 18, throughtheport in the bushing 17 corresponding to the annular discharge channel15, and through said channel l5'to the final discharge 3. The pistonvalve 18 will therefore be moved upwardly by reason of this pressureestablished at its lower end and the decrease in pressure effected atits upper end, thereby establishing communication between distributingconduit 1 and the arkilnular tercrlrliinal of the su l i e 4 throug themid e groove 20 in tih 515011 valve 18; and also establishingcommunication between the distributing conduit 2 and the dischargechannel 16 through the lower groove 21 of piston valve 18. The resultwill be that piston 6 will be moved downwardly because pressure willhave been established above same while the space in the cylinder 5 belowsame Will be connected to the exhaust. It will be clear that a reversesequence of operating conditions will follow the lowering of.the pilotvalve 8, namely, whereby the distributing conduit 2 will be placed incommunication with the annular terminal of the supply pipe 4 through thecentral groove 20 in the piston valve 18 and the distributing conduit 1will be placed in communication with the annular discharge channel 15through the upper groove 19- in the piston valve 18. In that case thepiston 6 will be moved upwardly.

. It will be seen that by means of this invention the pilot valve 8 maybe easily and quickly removed for inspection and cleaning of theinternal passages 27, 28, by unscrewing the sleeve 32. J

It should be understood that it is not desired to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,-

A distributing valve comprising a valve casing forming a chamber, asupply conduit connecting with said chamber, discharge conduitsconnecting with said chamber on opposite sides of the connection of saidsupply conduit therewith,distributing conduits connecting with saidchamber at points in-- termediate the connectionsof said supply and saiddischarge conduits therewith, a piston valve shiftable within saidchamber, and

a shiftable pilot valve within said piston valve and having grooves, andinternal passages connecting said grooves freely and directly with theportions of said chamber at the ends of said piston valve.

In testimony whereof I have afiixed my signature in the presence of twoWitnesses. J. ELOV ENGLESSON. Witnesses:

CHAS. L. BYRON, W. H. LIEBER.

